SD)ARGENTINA. STAMPS OF THE POSTAL UNIT. CIRCULATED TO MEXICO.È
O) 2020 CHAD, ART, MONUMENTS, SCULPTURES, HERITAGE, THE DAVID MICHAEL ANGEL, STATUE OF LIBERTY, MOUNT RUSHMORE, VAMPIRE OF STRYGE NOTRE DAME, MNH
O) 2020 CHAD, CHESS, GARRY KASPAROV, DEEP BLUE, IBM COMPUTER TO PLAY CHESS, FIRST TO BEAT GARRY KASPAROV, MNH
O) 2020 CHAD, CHESS, MAGNUS CARLSEN, ODD SHAPE, MNH
O) 2020 CHAD, MEDICINE, PANDEMIC, COVID 19, PROTOCOLS, FACE MASK, DISTANCE, QUARANTINE, HAND WASHING, INDICATIONS TO STOP THE DISEASE, TEST LABORATORY, MNH
O) 2021 CHAD, CHESS, MIKHAIL BOTVINNIK, KREMLIN MOSCOU, WORLD CHAMPIONSHIP, MNH
O) 2021 CHAD, CHESS, OLYMPICS, MIKHAIL TAL, MIKHAIL BOTVINNIK, BOBBY FISCHER, LEV POLUGAYEVSKI, MNH
SB) 1984 CHAD, 1984 SUMMER OLYMPICS, KAYAK SCENE, SCT C275, SOUVENIR MNH